We have two eucalyptus trees in our backyard that like dropping branches and I had a reasonable pile of these branches that I was turning into mulch. When I lifted up a branch from one of our trees that had been in the pile for a while a strange creature started running along it. It was moving at a good pace so I could not get a good look at it. When it slowed down a little I realised that it was actually two creatures, probably two Longhorn Beetle [Possibly Ectosticta cleroides based off the CSIRO guide that is linked in the field guide on CNM] that appeared to be locked together to mate. They eventually came to a stop in small hole in the branch. The front bettle, possibly the female looked like she was chewing into the wood while the beetle on her back, continued to hold on with amazing determination. I carefully dropped these two beetles off the branch.